Is it normal to have a blood clot the size of my tooth after a gingivectomy? i tried to rinse it out but it's really thick and stuck to my tooth.

How long has it been: While it is normal to have some clotting and bleeding after simple gingivectomy, the size you are describing is a bit bigger then usual. If it is no longer bleeding and isn't too tender (meaning it's been a few days since procedure) you can try to brush it off.

It is not normal: Go back to your dentist/surgeon for post-op appointment and management if needed.